<template>
  <div>
    <span>全选:</span>
    <input type="checkbox" v-model="isAll"/>
    <button @click="fanBtn">反选</button>
    <ul>
      <li v-for="(obj,ind) in arr" :key="ind">
        <input type="checkbox" v-model="obj.c"/>
        <span>{{obj.name}}</span>
      </li>
    </ul>
  </div>
</template>

<script>

export default {
  data() {
    return {
      arr: [
        {
          name: "猪八戒",
          c: false,
        },
        {
          name: "孙悟空",
          c: false,
        },
        {
          name: "唐僧",
          c: false,
        },
        {
          name: "白龙马",
          c: false,
        },
      ],
    };
  },
  
  computed:{
    isAll:{
      set(val){
        this.arr.forEach(obj => obj.c = val)
      },
      get(){
        return this.arr.every(obj=>obj.c === true)
      }
    }
  },
  methods: {
   fanBtn(){
      this.arr.forEach(obj => obj.c = !obj.c)
    }
  }
};
</script>

<style>
</style>